package com.leyou.item.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.leyou.item.dto.CategoryDTO;
import com.leyou.item.entity.Category;
import com.leyou.item.entity.CategoryBrand;
import com.leyou.item.mapper.CategoryMapper;
import com.leyou.item.service.CategoryBrandService;
import com.leyou.item.service.CategoryService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private CategoryBrandService categoryBrandService;

    @Override
    public List<CategoryDTO> queryByBrand(Long brandId) {
        //查询中间表，得到分类信息  select * from tb_category_brand where brand_id = 18374
        List<CategoryBrand> cbList = categoryBrandService.query().eq("brand_id", brandId).list();
        //处理数据，得到分类id集合
        List<Long> list = cbList.stream().map(CategoryBrand::getCategoryId).collect(Collectors.toList());
        //查询分类表，得到分类集合
        List<Category> categories = listByIds(list);
        return CategoryDTO.convertEntityList(categories);
    }
}
